database runtime acess

[ahwwq@mail.ustc.edu.cn]

hello:

I want to change a process valiable's field at runtime in the device support. The record type is writen by myself.

I do it using the dbPutField() as the 15th chapter of application developer's guide said.

but I always get an segment fault after i process the record's field at runtime. 

Am I do it somewhere wrong?